Guide bushing



Aug. 14, 1923.

o; R. BRINEY GUIDE BUSHING Filed June 14, 192-2 INVENTOR dfBr/rre BY Y Z/ ATTORNEY owns a. sewer, or ron'rmc, MICHIGAN.

sexton susmne.

Application filed June 14., 1922. Serial No. 568,828.

l o all whom it may mm:

Be it known that I, O'r'rrs R. Burner, a citizen of the United States, residing at Poutiac, county of Oakland, and State of Michi-' gen, have invented a new and useful Improvement in Guide Bushings, of which the following is a specification.

My invention relates to guide bushings Y whichtelescope into .each other and lock to each other without additional mechanism.

The ob'ect of my invention is a means of guiding rills, reamers, or other tools in an eflicient manner and provide this means with time and labor saving features.

I attain this object by the mechanism illustrated in the accompanying drawing which exemplifies the present invention in a guide bushin having one slip bushing and in which drawing Fig. 1 is a general side view of a guide bushing partly broken away to 'show the mechanism clearly; Fig. 2 is a section on line 22 of Fig. 1 showing the bushings in locked position; and Fig. 3 in a sectional view similar to Fig. 2 but showing the $5 bushings in unlocked position.

Similar reference characters refer to similar parts throughout theviews. p

The present invention is an improvement over my application for United States patent now known as Serial-No. 450.935.

Guide bushings, as formerly made with a counterbore in the liner bushing anda head on the slip bushing which head entered the counterbore, have the disadvantage of chips collecting in the counterbore when changing or, for other reasons, removing the slip bushing. It is a rather diflicult and time consuming operation to properly clean the bottom 0 this counterbore so that the head of the sli bushing can rest squarely on the bottom 0- 'the counterbore. r

The present invention eliminates the seat 1 of the head on the bottom of the counterbore and provides for such seat on the top of the liner bushing "where such seat can readily be cleaned and thereby save considerable time in operation. 1

Jigs and fixtures with guide bushings are extensively used for rapid and accurate production of work and even a slight improve ment on these jigs and bushings, to save time or produce better work, is a decided advance in'the art and of benefit owing to the quantity of such bushings used,

Referring now particularly to the drawing which shows the liner bushing A and the slipbushing B therein.

"' The liner bushing A has the body portion 10, the head 11 concentric with the body portion; the central bore 12 concentric with the body portion, and the counterbore 13 eccentric with the body portion.

The wall of the counterbore 13 is inclined to the longitudinal axis of the bushing for thcpurpose hereinafter set forth.

The top 14 ofthe liner bushing should be square with the body portion.

The slip. bushing B has the body portion 15. the main bore 16 concentric with the body portion, the head 17 concentric with the body-portion. the connterbore 18 providecl as a lubricant receptacle, and the collar 19 eccentric with the body portion.

ttxS seen in Fig. 2, the body portions 10 and i 15 are concentric with the center 20; the counterbore 13 is concentric with the center 21 but eccentric with the center 20; and the collar 19 is concentric with the center 22 but eccentric with the center 20.

It is noted that the'length of the collar 19 is less than the depth. of the counterbore 13 and that the outer circumferential surface of this collar is inclined to the longitudinal axis of the bushings and that this inclination corresponds to the inclination of the outer wall of the counterbore 13.

In" order to insert or remove the slip bushing B. it is rotated until thecenters 21 and 22 coincide as seen at 23 in Fig. 3. At this point. the collar 19 will readily slip into the counterfore 13.

In order to lock the bushings to each other. .either of the bi'lshings may be rotated in either direction. whereupon the eccentrics become opposed, and the centers 20. 21. and 22 may assume the relation shown in Fig. 2. and both l'iushinosare locked firmlv to each other.

When the bushings are so rotated, the in clination of the wall of the counterbore 13 and the outer circumstiihce of the collar also forces the liner bushing downward so that the under side of the head 17 rests firm- 1y upon the end 14 of the liner biishing, but the lower end of the collar 19 does not engage the lower wall of the counterbore thus providing the space 21 A The end 14 can be cleaned readily when I tion, the chips could readily enter the open the slip bushing is notin lace and the bot tom wall of the counter ore need not; be cleaned thoroughly since the slip bushing does not rest thereon.

It will be seen that this invention provides a guide bushing which saves consider able time in changing slip bushings as is necessary when changing from drill to'reamer in'the same jig for instance, and eliminates the former tedious operation of cleaning out the counterbore.

Furthermore, the structure shown here prevents chips etc'from entering the coun- 'terbore and thereby eliminates collection of chips therein; whereas, in former construcportion between the eccentric elements and collect there and clog the movement of the eccentric elements.

tion.

the wall thereof by a rotative movement 0 said slip bushing and bind said slip bushing by both sidewise and lateral pressure with'a All of which disadvantages are eliminated in the present inven- I claim:

1. A guide bushing comprising. a liner bushing provlded with an-eccentric counterbore,-a nd a slip bushing guided in said liner bushing and provided with an eccentric collar disposed in said counterbore to engage wall. a slip bushing guided by both sidewise' and lateral pressure with a space between the end of said eccentric gold- 'lar and the bottom of said counterbore.

3. A guide bushingcomprising, a liner bushing provided with an eccentric counterbore having an inclined circumferential bushing and provided with a head and with an eccentric collar disposed in said counterbore and the outer circumference thereof in 'chned to engage said inclined wall by a rotative movement of said slip bushing and 'bind said head to said liner bushing by a lateral pressure and the body of said slip bushing to said linerbushmg by a sidewise pressure with a space between the end of said ecf centric collar and the bottom of said counterbore. OTTIS R. BRINEY in said liner 

